Error: Helo command rejected: Host not found

Hi,
an incoming email message is rejected by one of our ISPConfig 3.1 server (Debian 9, Apache, Dovecot, Postfix) with the following message: Helo command rejected: Host not found

I think it's caused by the non-compliance of reject_non_fqdn_helo_hostname in smtpd_helo_restrictions of Postfix (main.cf) because the helo in the incoming message ends with .local (it's probably generated by the Microsoft Exchange server bad setting of the sender).

Is there a field in the Ispconfig panel where I can place an exception to get that mail (or all that ends with .local helo) to accept?

Or do I have to compile the /etc/postfix/helo_access file at the command line (putting something like this: /^local$/ OK)?

hi guys could i get some more info on this.
my client has had 2 our of 300 clients say that are sending emails but they are being blocked due to a helo issue. as it is only 2 of his clients that are not able to send and the other clients are able to send us emails fine he isnt really concerned about it. but i am trying to avoid "all" issues so could you elaborate on what is meant by "compile the /etc/postfix/helo_access file at the command line (putting something like this: /^local$/ OK)"